Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
96% | 4% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
96% | 4% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 36°C | 96% |
| 37°C | 5% |
| 30°C or below | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 38°C | 0% |
| 39°C | 0% |
| 40°C or higher | 0% |
Market context
Shanghai starts August in its hottest season, so the market is really about whether the airport station posts a routine oppressive high or a brief spike into proper heatwave territory. Long-run August averages cluster around the low- to mid-30s Celsius, with typical daily highs near 32°C and occasional extremes much higher during major hot spells.[2][4][5]
That makes a 0% crowd-implied chance on the top temperature range look detached from climatology: Shanghai has a history of severe August heat, including a 41°C all-time high and multiple recent August stretches above 35°C in the city proper.[3][5] Comparable August data also shows daily highs can sit around 30–35°C even without exceptional conditions, so any forecast band centred on mild weather would need a strong cooling signal to be credible.[2][8][15]
For traders, the main catalysts are the latest Shanghai forecasts, any typhoon-track changes in the East China Sea, and whether showers or onshore flow cap daytime heating at Pudong Airport. Current August outlooks from weather services point to highs mostly in the high-20s to low-30s Celsius for parts of the month, but the day-specific path matters more than the monthly average because the market settles on the single highest reading for 2 August.[11][16] If the forecast nudges hotter, the upper temperature bands become more relevant; if cloud cover or rain arrives early, the distribution shifts down quickly.[8][11]
Methodology
Sports-specific comparison page for Highest temperature in Shanghai on August 2?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
FAQ
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- What are live sports odds on Polymarket?
- Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.
- What's the difference between match odds and outright odds?
- Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.
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